JPH11268628A - Anti-skid device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent continuous application of electricity to a solenoid or a motor with a simple method, by disposing, near a coil of the solenoid which changes the hydraulic pressure to wheel brakes, a solenoid protective member for providing protection by cutting off or restricting application of electricity to the solenoid. SOLUTION: A solenoid 5 and a reservoir 7 are provided inside an anti-skid device 1. The anti-skid device 1 is also provided with a hosing 3 having a hydraulic circuit portion 6 and a solenoid portion 4. A motor 2 is fixed to the housing 3 by means of bolt or the like. The solenoid portion 4 is disposed in the housing in a state where a solenoid 5 is fixed to a base member 8. The solenoid 5 is formed by winding a coil 9 around a cylindrical bobbin 11. A temperature sensitive element 13 made of heat sensitive resistor element, bimetal and the like is connected in series or in parallel with the coil 9 of the solenoid 5. Accordingly, when the temperature around the solenoid 5 exceeds a predetermined value, application of electricity to the solenoid 5 is cut off to protect the solenoid 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-skid device, and more particularly to a protection device for a solenoid or a motor of an anti-skid device.

[0002]

2. Description of the Related Art Conventionally, an anti-skid device controls a brake for a wheel, and various measures are taken in terms of safety. In particular, in the field of vehicles and aircraft, etc., with the aim of protecting human safety,
In case of equipment failure, sufficient measures must be taken to prevent fire.

[0003] Such an anti-skid device changes the brake fluid pressure by energizing a solenoid or a motor (pump motor) to apply a brake to a wheel. In this case, the solenoid or the motor is energized. In this way, brake control is performed by repeatedly increasing (increasing) and decreasing (reducing) the brake pressure on the wheels.

Therefore, it is used for an anti-skid device,
For the purpose of protecting a motor serving as a step-up source for increasing a brake pressure, a method of restricting an energization time of a current flowing through the motor within a predetermined time has been adopted, and Japanese Patent Application Laid-Open No. 8-175370 discloses a method. There has been known an apparatus that performs self-determination of a pump motor rotation abnormality and issues a warning at an early stage of the abnormality.

The abnormality detection of the motor is performed by driving the motor for a predetermined time when the vehicle speed becomes equal to or higher than a predetermined vehicle speed, stopping the current supply to the motor, and after a predetermined time, causing an induced voltage of the motor rotating by inertia force. Is detected, and the determination of the motor is performed based on the voltage level.

[0006]

However, as described above, the controller controls the energization time of the motor or detects an induced voltage due to the rotation of the motor, as described above.
The motor that protects the motor by performing a self-diagnosis of the rotation state is based on the premise that the controller is operating normally. For example, if the controller runs out of control and the motor malfunctions (failure state), And so on, which cannot be sufficiently dealt with.
For this reason, in a vehicle, an aircraft, and the like that require safety in particular, it is necessary to take measures to reliably prevent a fire due to continuous energization.

On the current supply side (upstream) to the solenoid or motor of the anti-skid device, a fuse is generally provided for protection in a vehicle, an aircraft, or the like, but this fuse is connected to a downstream device. When a large current flows through the device (below the fuse), it is used to cut off a path through which the current flows.

[0008] For this reason, when a person unfamiliar with maintenance or the like removes a specified fuse and mistakenly installs a fuse having a larger capacity than the specified fuse, a failure or short-circuit causes a large current to flow, and the fuse may fail. When cut, the equipment damage on the downstream side is large.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a device which can prevent continuous energization of a solenoid or a motor by a simple method and can provide sufficient protection. Subject.

[0010]

The technical means taken to solve the above-mentioned problem is provided with a solenoid for changing the hydraulic pressure with respect to the wheel brake, and energization is performed by a controller to a solenoid winding of the solenoid. In the anti-skid device to be performed, a solenoid protection member that protects the solenoid by shutting off or suppressing power supply to the solenoid is disposed near the solenoid winding.

[0011] With the above structure, the solenoid protection member is provided near the solenoid winding to protect the power by shutting off or suppressing the power supply to the solenoid. Therefore, the continuous power supply to the solenoid can be prevented by the solenoid protection member. Sufficient solenoid protection is possible with a simple method.

In this case, a motor for supplying hydraulic pressure to the wheel brakes is further provided, and a motor protection member is provided in the vicinity of the motor winding where power is supplied to the motor to protect the motor by interrupting or suppressing the power supply to the motor. For example, continuous energization of the motor can be prevented by the motor protection member, and sufficient protection of the motor can be achieved by a simple method.

If the protection member is a heat-sensitive resistance element or a bimetal, the solenoid or the motor can be reliably protected by an inexpensive structure.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the anti-skid device 1. The anti-skid device 1 has a solenoid 5 and a reservoir 7 inside, and a housing 3 having a hydraulic circuit 6 and a solenoid 4 and a pump motor (hereinafter referred to as a motor) 2 fixed to the housing 3 by a fixing member such as a bolt. Have been.

A solenoid 5 (for example, 5a and 5b in this case) is fixed to a base member 8 such as a substrate and disposed in the housing in the solenoid section 4. Solenoid 5
In the figure, a wire (winding) 9 in which a copper wire is coated with enamel is continuously wound on a cylindrical bobbin 11, and the winding 9 is connected in series or in parallel to protect the solenoid 9 from a temperature-sensitive element 1.
3 are soldered to the two terminals 12. The temperature sensing element 13 is fixed to the winding 9 or in the vicinity thereof so as not to come off with a silicon-based sealant or the like. When the temperature in the vicinity exceeds a predetermined temperature, the resistance value sharply increases as shown in FIG. The thermal resistance element (P
TC) or bimetal. In addition, coil bobbin 1
A plunger (not shown) slidable on the inner diameter of the elongated sleeve 14 is disposed on the inner diameter of the sleeve 1. When the winding 9 is energized, the plunger is moved to open the port of the solenoid 5. It can be opened and closed.

FIG. 3 is a sectional view of the motor 2. A bearing 22 is provided in a yoke 21 serving as a housing of the motor 2.
A shaft 24 rotatably supported by 23 is provided. Two or four arc-shaped magnets 19 are fixed in the yoke 21. On the other hand, a core 25 and a commutator 26 are provided on the shaft 24 by press-fitting, and a motor winding 27 is wound around the core 25. In this case, the ends of the winding 27 are respectively connected to different segments of the commutator 26 (26a, 26b), and the commutator 26 is connected to the commutator 26 via the two brushes 28 supported by the support member 29 via the temperature sensing element 33. Power is supplied. This temperature sensing element 33
Is fixed in the vicinity of the winding 27 in the yoke, and uses the above-mentioned thermosensitive resistance element (PTC) or bimetal whose resistance value rises rapidly when the ambient temperature exceeds a predetermined temperature.

Next, the operation of the motor 2 will be described. When power is externally supplied to the motor 2, the supplied power is transmitted to the brush 28a and the commutator 26a,
An electric current flows through the windings 27a,..., The commutator 26b, the temperature sensing element 33, and the brush 26b. When a current flows through the winding 27, an electromagnetic force acts between the winding 27 and the magnet 19, and the shaft 24 of the motor 2 rotates,
When the shaft 24 rotates, the pump 30 attached to the end of the shaft 24 is driven.

FIG. 4 shows a configuration of a hydraulic circuit of the anti-skid device 1. In the process of moving from a brake pressure source (for example, a master cylinder) to a wheel cylinder 10 for applying a wheel brake, a normally-open type pressure-increasing solenoid 5a
And a check valve 44 for returning pressure only to the brake pressure generation source side in parallel with the solenoid 5a.
Further, a normally-closed decompression solenoid 5b is provided so as to release the pressure applied to the wheel cylinder 10 for operating the brake on the wheel 15, and when the solenoids 5a and 5b are energized, the pressure of the wheel cylinder 10 is reduced. The brake pressure is released to the reservoir 7, and the pressure can be reduced.

On the other hand, when increasing the brake pressure applied to the wheel cylinder 10, the pump 30 is rotated by driving the motor 2 to suck up the brake fluid accumulated in the reservoir 7 through the check valve 45, By supplying the brake pressure to the wheel cylinder 10 via the solenoid 5a, the brake pressure can be increased.

As described above, during the anti-skid control, the rotation of the wheel 15 is detected by the wheel speed sensor provided on the wheel 15, and the open / close state of the solenoids 5a and 5b for increasing or decreasing the pressure is switched to control the brake pressure. Thus, anti-skid control can be performed.

FIG. 5 shows a motor 2 and a solenoid 5 (5a, 5a).
FIG. 3B shows the driving mode of FIG.
Is supplied with power from a power source such as a battery. When the controller 20 outputs a motor drive signal at the time of driving the motor, the transistor Tr1 is turned on by the motor output signal, and a current flows through the coil of the relay RY.
Then, the open contact of the relay RY is turned on (closed state), and current flows through the motor 2. In this case, the contact point of the temperature sensing element 33 is closed, and the temperature rises due to the current flowing time through the motor winding 27, and the temperature rise causes the predetermined temperature t ° C (for example, 15 ° C.).
When the temperature becomes higher than about 0 ° C.), the contact is opened and the motor 2 stops.

As for the solenoid 5, the controller 20 outputs a solenoid drive signal when the solenoid is driven. The transistor Tr2 is turned on by this solenoid drive signal, and a current flows through the winding 9 of the solenoid 5. In this case, the contact of the temperature sensing element 33 is closed, and the contact is opened when the temperature becomes higher than the predetermined temperature t ° C. due to the temperature rise of the motor winding 27 due to continuous energization.

That is, continuous energization of the motor 2 and the solenoid 5 can be prevented by the temperature sensing elements 13 and 33 provided in the middle of the path for energizing the winding 27 of the motor 2 and the winding 9 of the solenoid 5.

Actually, the harness 16 and the bobbin 11 connected to the solenoid winding 9 of the solenoid 5 are often made of a synthetic resin. If not, the controller 20
If the current is continuously supplied due to the abnormal operation, heat is generated due to short-circuiting of the adjacent windings and the resin such as the bobbin 11 is melted. Since the controller 33 is disposed, even if the controller 20 breaks down and the motor 9 and the windings 9 and 27 of the solenoid 5 are continuously energized, the temperature sensing element 1
Since the power supply is cut off or suppressed at a predetermined temperature or higher, the temperature rise of the motor 2 and the solenoid 5 due to the continuous power supply can be prevented.

In this case, if a thermal resistance element is used for the temperature sensitive elements 13 and 33, the resistance value changes depending on the temperature, and the resistance value increases as the temperature rises, so that the current value can be reliably suppressed. In the case of using a bimetal, when the temperature exceeds a certain level, the current is cut off, so that a temperature rise above a certain level can be prevented, so that a fire can be reliably prevented.

From the above, the motor 2 and the solenoid 5
Can be reduced to the minimum necessary, and it is possible to reduce the size and weight. Generally, since the weight of the solenoid 5 and the coil portion of the motor 2 is heavy, the effect is particularly large in a field where lightness is required. In addition, since the overheating prevention is a dual system, complicated overheating prevention control is not required, so that the control of the controller can be simplified.

[0028]

According to the present invention, there is provided an anti-skid device having a solenoid for changing a hydraulic pressure with respect to a wheel brake and energizing a solenoid winding of the solenoid by a controller. The solenoid protection member that cuts off or suppresses the energization of the solenoid protects it, and the solenoid protection member that cuts off or suppresses the current supply to the solenoid protects it near the solenoid winding. Continuous energization can be prevented by the solenoid protection member, and sufficient protection can be provided.

In this case, a motor for supplying hydraulic pressure to the wheel brakes is further provided, and a motor protection member is provided in the vicinity of the motor winding where power is supplied to the motor to protect the power by shutting off or suppressing the power supply to the motor. For example, continuous energization of the motor can be prevented by the motor protection member, and sufficient protection can be achieved.

If the protection member is a heat-sensitive resistance element or a bimetal, the solenoid or the motor can be reliably protected by an inexpensive structure.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a configuration of an anti-skid device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of a solenoid part shown in FIG.

FIG. 3 is an enlarged view of a main part of the motor shown in FIG. 1;

FIG. 4 is a hydraulic circuit diagram of the anti-skid device according to the embodiment of the present invention.

FIG. 5 is a connection diagram of a motor and a solenoid of the anti-skid device according to one embodiment of the present invention.

FIG. 6 is a characteristic diagram of a temperature sensing element of the anti-skid device according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 anti-skid device 2 motor 5 solenoid 5a pressure increasing solenoid (solenoid) 5b pressure reducing solenoid (solenoid) 9 winding (solenoid winding) 10 wheel cylinder (wheel brake) 13 temperature sensing element (solenoid protection member) 15 wheel 20 controller 27 Winding (solenoid winding) 33 Temperature sensing element (motor protection element)

Claims (3)

[Claims] 1. An anti-skid device comprising a solenoid for changing a hydraulic pressure with respect to a wheel brake, and energizing a solenoid winding of the solenoid by a controller. An anti-skid device, comprising a solenoid protection member for protecting by shutting off or suppressing energization. 2. A motor protection device, further comprising a motor for supplying hydraulic pressure to a wheel brake, and a motor protection member provided near a motor winding for supplying power to the motor to protect the motor by cutting off or suppressing power supply to the motor. The anti-skid device according to claim 1. 3. The anti-skid device according to claim 1, wherein the protection member is one of a thermal resistance element and a bimetal.